1. World Health Organization. Global strategy and action plan on ageing and health. Geneva, World Health Organization. 2017,1-56
2. Bennadi D, Reddy C. Oral health related quality of life. JInt Soc Prevent Communit Dent. 2013,3(1),1-6
3. Rosli TI, Chan YM, Kadir RA et al. Association between oral health-related quality of life and nutritional status among older adults in district of Kuala Pilah, Malaysia. BMC Public Health. 2019,19(Suppl 4)),547-554
4. Fiorellini JD, Kim D, Chang YC. Anatomy, structure, and function of the periodontium. In: Newman MG, Takei HH, Klokkevold PR, Carranza FA, Eds. Newman and Carranza's Clinical Periodontology 13th ed. St. Louis, Elsevier Saunders, 2019,19-49
5. Slots J. Periodontitis: facts, fallacies, and the future. Periodontol 2000 2017,75(1),7-23